CAJ | 학술논문

针对非高斯噪声环境衰落信道中的正交空时分组码(OSTBC)性能进行研究.基于非高斯噪声建模理论,将空时分组码系统的噪声环境建模为对称α-稳定分布噪声,给出噪声采样信号的概率密度函数及特征函数.推导了基于最大似然(ML)译码的OSTBC系统的误符号率(SER),并且对不同衰落信道条件下系统性能进行估计.仿真结果表明,OSTBC的性能随噪声特征指数α的减小而降低.当噪声脉冲性较强时,系统对于Nakagami-m和Rician衰落信道的参数m和K不再敏感.
침대비고사조성배경쇠락신도중적정교공시분조마(OSTBC)성능진행연구.기우비고사조성건모이론,장공시분조마계통적조성배경건모위대칭α-은정분포조성,급출조성채양신호적개솔밀도함수급특정함수.추도료기우최대사연(ML)역마적OSTBC계통적오부호솔(SER),병차대불동쇠락신도조건하계통성능진행고계.방진결과표명,OSTBC적성능수조성특정지수α적감소이강저.당조성맥충성교강시,계통대우Nakagami-m화Rician쇠락신도적삼수m화K불재민감.
The performances of orthogonal space-time block coding (OSTBC) over fading channels with α-stable noise are investigated. Based on the theory of non-Gaussian noise modeling, the noise environments of STBC systems can be modeled as α stable distributed and the probability density function and characteristic function of the noise signals in OSTBC systems are presented in terms of this model. The average symbol error rate (SER) is derived for the maximum likelihood (ML) receiver in α-stable noise environment and the performances over various fading channels are evaluated. The simulation results show that the performances of OSTBC degrade with the characteristic exponent a decreasing and are insensitive to fading parameter m of Nakagami - m channels as well as Rician factor K of Rician channels with respect to highly impulsive noise.